Piano-forte



(No Modelf) P- KRUMSGHEID No. 443,578. Patented Deo. so, 18961 UNITED STATES PATENT OFFICE.

PETER KRUMSOHEID, OF BOSTON, MASSACHUSETTS.

PIANO-FO RTE.

SPECIFICATION forming part of Letters Patent No. 443,578, dated December 30, 1890.

Application led May '7, 1890. Serial No. 350,872. (No model.)

To all whom t may concern:

Be it known that I, PETER KEUMSCHEID, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Piano-Fortes, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of my invention is to so construct the upper end connection of a pianoforte bracket that the bracket is easily attached and detached, firmly held, and perfectly adjustable. This object I attain by the mechanism shown in the accompanying drawings, in which- Figure I shows in elevation a piano-forte bracket in connection with my device. Fig. 2 shows the upper connecting-bolt and the locking device. Figs. 3 and 4 illustrate the working of the locking device, the views being from the interior looking outward, the parts being represented in full size.

In the drawings, B represents a pianoforte bracket, which may be in any desired style. The lower end of this bracket is recessed and is supported on a pin A or in any of the ordinary ways.

The novelty of my device is in connection of fastening or locking the upper end, the said upper end having a part D, the inner face of which is hollowed out hemispherically and adapted to lit the rounded head H of the bolt E. The upper end of the bracket has a hook C, which is intended to engage with a snail-cam K, the construction and action of which I will now describe. y

The snail-cam K is formed substantially as shown in the drawings and is adapted to turn on the bolt E near the head of the same; but between the under side of the head II of the bolt and the cam K, I have a small elastic washer, so that the cam will exert a yielding pressure on the hook C, so that the upper terminations D and C form a kind of fork, the two parts of which embrace the head I'I of the bolt, and also a part of the cam K, and are thus held very firmly in the desired position. The snail-cam K extends from the point I to P on an incline-that is, it constitutes an arc-shaped Wedge, which as the cam is turned firmly locks the forked part D O of the bracket to the head II of the bolt E.

For convenience in adjusting the bolt E, thc head is made polygonal for receiving a wrench, so that the bolt may be readily turned---that is, screwed in or out, as may be required to get the proper adjustment.

The cam K is cut away at K, so that when the cani is turned by the lever L into the p0- sition shown in Fig. et then it is entirely disengaged from the arm O and the bracket B is released. It is obvious that when the cam K is turned, as shown in Fig. 3, it engages with the arm O, and thus holds the bracket firmly in place.

I do not confine myself to the form and arrangement of the parts of this device, as they may be varied and yet embody my invention.

I claime-u I. The combination of the bracket B, hav ing a forked head D D, with the bolt E, provided with a head H, and the cam K, substantially as and for the purpose set forth.

2. The combination of the bracket B, hav! ing a forked head D C, with the headed bolt E, elastic washer W, and cam K, substantially as and for the purpose set forth.

3. The combination of the bracket B and arm O with the cam K and bolt E, substantially as 'and for the purpose set forth.

PETER KRIIMSOHEID.

Witnesses:

WILLIAM EDsoN, ALONZO F. ANDEEws. 

